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Finding the Fourth Proportional to 1,140.72, 1,711.07 and 653.42

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Solution

The fourth proportional to 1,140.72, 1,711.07 and 653.42 is: 980.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.72 : 1,711.07 = 653.42 : x
  2. Step 2: Convert to fraction form
    1,140.72/1,711.07 = 653.42/x
  3. Step 3: Cross multiply
    1,140.72x = 1,711.07 × 653.42
  4. Step 4: Simplify right side
    1,140.72x = 1,118,050.82
  5. Step 5: Solve for x
    x = 1,118,050.82/1,140.72
  6. Step 6: Final answer
    x = 980.13

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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.