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Finding the Fourth Proportional to 761.93, 1,140.67 and 688.98

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Solution

The fourth proportional to 761.93, 1,140.67 and 688.98 is: 1,031.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.93 : 1,140.67 = 688.98 : x
  2. Step 2: Convert to fraction form
    761.93/1,140.67 = 688.98/x
  3. Step 3: Cross multiply
    761.93x = 1,140.67 × 688.98
  4. Step 4: Simplify right side
    761.93x = 785,898.83
  5. Step 5: Solve for x
    x = 785,898.83/761.93
  6. Step 6: Final answer
    x = 1,031.45

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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.