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Finding the Fourth Proportional to 890.63, 1,228.48 and 558.76

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Solution

The fourth proportional to 890.63, 1,228.48 and 558.76 is: 770.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.63 : 1,228.48 = 558.76 : x
  2. Step 2: Convert to fraction form
    890.63/1,228.48 = 558.76/x
  3. Step 3: Cross multiply
    890.63x = 1,228.48 × 558.76
  4. Step 4: Simplify right side
    890.63x = 686,425.48
  5. Step 5: Solve for x
    x = 686,425.48/890.63
  6. Step 6: Final answer
    x = 770.72

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Half scale
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Double scale
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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.