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Finding the Fourth Proportional to 1,318.95, 1,978.42 and 497.40

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Solution

The fourth proportional to 1,318.95, 1,978.42 and 497.40 is: 746.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.95 : 1,978.42 = 497.40 : x
  2. Step 2: Convert to fraction form
    1,318.95/1,978.42 = 497.40/x
  3. Step 3: Cross multiply
    1,318.95x = 1,978.42 × 497.40
  4. Step 4: Simplify right side
    1,318.95x = 984,068.57
  5. Step 5: Solve for x
    x = 984,068.57/1,318.95
  6. Step 6: Final answer
    x = 746.10

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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.