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Finding the Fourth Proportional to 840.32, 1,160.28 and 578.96

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Solution

The fourth proportional to 840.32, 1,160.28 and 578.96 is: 799.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.32 : 1,160.28 = 578.96 : x
  2. Step 2: Convert to fraction form
    840.32/1,160.28 = 578.96/x
  3. Step 3: Cross multiply
    840.32x = 1,160.28 × 578.96
  4. Step 4: Simplify right side
    840.32x = 671,755.71
  5. Step 5: Solve for x
    x = 671,755.71/840.32
  6. Step 6: Final answer
    x = 799.40

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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.