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Finding the Fourth Proportional to 890.32, 1,228.36 and 624.76

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Solution

The fourth proportional to 890.32, 1,228.36 and 624.76 is: 861.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.32 : 1,228.36 = 624.76 : x
  2. Step 2: Convert to fraction form
    890.32/1,228.36 = 624.76/x
  3. Step 3: Cross multiply
    890.32x = 1,228.36 × 624.76
  4. Step 4: Simplify right side
    890.32x = 767,430.19
  5. Step 5: Solve for x
    x = 767,430.19/890.32
  6. Step 6: Final answer
    x = 861.97

Related Problems

Find fourth proportional to 445.16, 614.18 and 312.38
Half scale
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Double scale
Find fourth proportional to 891.32, 1,229.74 and 625.76
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.