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Finding the Fourth Proportional to 1,005.30, 1,387.29 and 557.19

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Solution

The fourth proportional to 1,005.30, 1,387.29 and 557.19 is: 768.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.30 : 1,387.29 = 557.19 : x
  2. Step 2: Convert to fraction form
    1,005.30/1,387.29 = 557.19/x
  3. Step 3: Cross multiply
    1,005.30x = 1,387.29 × 557.19
  4. Step 4: Simplify right side
    1,005.30x = 772,984.12
  5. Step 5: Solve for x
    x = 772,984.12/1,005.30
  6. Step 6: Final answer
    x = 768.91

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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.