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Finding the Fourth Proportional to 691.59, 1,035.40 and 647.95

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Solution

The fourth proportional to 691.59, 1,035.40 and 647.95 is: 970.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.59 : 1,035.40 = 647.95 : x
  2. Step 2: Convert to fraction form
    691.59/1,035.40 = 647.95/x
  3. Step 3: Cross multiply
    691.59x = 1,035.40 × 647.95
  4. Step 4: Simplify right side
    691.59x = 670,886.38
  5. Step 5: Solve for x
    x = 670,886.38/691.59
  6. Step 6: Final answer
    x = 970.07

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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.