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Finding the Fourth Proportional to 761.84, 1,136.20 and 688.02

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Solution

The fourth proportional to 761.84, 1,136.20 and 688.02 is: 1,026.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.84 : 1,136.20 = 688.02 : x
  2. Step 2: Convert to fraction form
    761.84/1,136.20 = 688.02/x
  3. Step 3: Cross multiply
    761.84x = 1,136.20 × 688.02
  4. Step 4: Simplify right side
    761.84x = 781,726.60
  5. Step 5: Solve for x
    x = 781,726.60/761.84
  6. Step 6: Final answer
    x = 1,026.11

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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.