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Finding the Fourth Proportional to 690.75, 1,032.18 and 525.30

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Solution

The fourth proportional to 690.75, 1,032.18 and 525.30 is: 784.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.75 : 1,032.18 = 525.30 : x
  2. Step 2: Convert to fraction form
    690.75/1,032.18 = 525.30/x
  3. Step 3: Cross multiply
    690.75x = 1,032.18 × 525.30
  4. Step 4: Simplify right side
    690.75x = 542,204.15
  5. Step 5: Solve for x
    x = 542,204.15/690.75
  6. Step 6: Final answer
    x = 784.95

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.