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Finding the Fourth Proportional to 619.40, 854.16 and 370.76

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Solution

The fourth proportional to 619.40, 854.16 and 370.76 is: 511.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.40 : 854.16 = 370.76 : x
  2. Step 2: Convert to fraction form
    619.40/854.16 = 370.76/x
  3. Step 3: Cross multiply
    619.40x = 854.16 × 370.76
  4. Step 4: Simplify right side
    619.40x = 316,688.36
  5. Step 5: Solve for x
    x = 316,688.36/619.40
  6. Step 6: Final answer
    x = 511.28

Related Problems

Find fourth proportional to 309.70, 427.08 and 185.38
Half scale
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Double scale
Find fourth proportional to 620.40, 855.54 and 371.76
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.