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Finding the Fourth Proportional to 1,130.69, 1,560.08 and 688.71

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Solution

The fourth proportional to 1,130.69, 1,560.08 and 688.71 is: 950.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,130.69 : 1,560.08 = 688.71 : x
  2. Step 2: Convert to fraction form
    1,130.69/1,560.08 = 688.71/x
  3. Step 3: Cross multiply
    1,130.69x = 1,560.08 × 688.71
  4. Step 4: Simplify right side
    1,130.69x = 1,074,439.25
  5. Step 5: Solve for x
    x = 1,074,439.25/1,130.69
  6. Step 6: Final answer
    x = 950.26

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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.