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Finding the Fourth Proportional to 763.53, 1,053.50 and 515.31

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Solution

The fourth proportional to 763.53, 1,053.50 and 515.31 is: 711.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.53 : 1,053.50 = 515.31 : x
  2. Step 2: Convert to fraction form
    763.53/1,053.50 = 515.31/x
  3. Step 3: Cross multiply
    763.53x = 1,053.50 × 515.31
  4. Step 4: Simplify right side
    763.53x = 542,876.51
  5. Step 5: Solve for x
    x = 542,876.51/763.53
  6. Step 6: Final answer
    x = 711.01

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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.