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Finding the Fourth Proportional to 1,513.32, 2,267.88 and 781.39

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Solution

The fourth proportional to 1,513.32, 2,267.88 and 781.39 is: 1,171.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,513.32 : 2,267.88 = 781.39 : x
  2. Step 2: Convert to fraction form
    1,513.32/2,267.88 = 781.39/x
  3. Step 3: Cross multiply
    1,513.32x = 2,267.88 × 781.39
  4. Step 4: Simplify right side
    1,513.32x = 1,772,098.75
  5. Step 5: Solve for x
    x = 1,772,098.75/1,513.32
  6. Step 6: Final answer
    x = 1,171.00

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.