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Finding the Fourth Proportional to 864.50, 1,193.12 and 570.38

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Solution

The fourth proportional to 864.50, 1,193.12 and 570.38 is: 787.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.50 : 1,193.12 = 570.38 : x
  2. Step 2: Convert to fraction form
    864.50/1,193.12 = 570.38/x
  3. Step 3: Cross multiply
    864.50x = 1,193.12 × 570.38
  4. Step 4: Simplify right side
    864.50x = 680,531.79
  5. Step 5: Solve for x
    x = 680,531.79/864.50
  6. Step 6: Final answer
    x = 787.20

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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.