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Finding the Fourth Proportional to 761.65, 1,142.69 and 646.90

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Solution

The fourth proportional to 761.65, 1,142.69 and 646.90 is: 970.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.65 : 1,142.69 = 646.90 : x
  2. Step 2: Convert to fraction form
    761.65/1,142.69 = 646.90/x
  3. Step 3: Cross multiply
    761.65x = 1,142.69 × 646.90
  4. Step 4: Simplify right side
    761.65x = 739,206.16
  5. Step 5: Solve for x
    x = 739,206.16/761.65
  6. Step 6: Final answer
    x = 970.53

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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.