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Finding the Fourth Proportional to 1,068.72, 1,603.18 and 521.40

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Solution

The fourth proportional to 1,068.72, 1,603.18 and 521.40 is: 782.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,068.72 : 1,603.18 = 521.40 : x
  2. Step 2: Convert to fraction form
    1,068.72/1,603.18 = 521.40/x
  3. Step 3: Cross multiply
    1,068.72x = 1,603.18 × 521.40
  4. Step 4: Simplify right side
    1,068.72x = 835,898.05
  5. Step 5: Solve for x
    x = 835,898.05/1,068.72
  6. Step 6: Final answer
    x = 782.15

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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.