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Finding the Fourth Proportional to 42,690.40, 64,016.40 and 16,386.40

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Solution

The fourth proportional to 42,690.40, 64,016.40 and 16,386.40 is: 24,572.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,690.40 : 64,016.40 = 16,386.40 : x
  2. Step 2: Convert to fraction form
    42,690.40/64,016.40 = 16,386.40/x
  3. Step 3: Cross multiply
    42,690.40x = 64,016.40 × 16,386.40
  4. Step 4: Simplify right side
    42,690.40x = 1,048,998,336.96
  5. Step 5: Solve for x
    x = 1,048,998,336.96/42,690.40
  6. Step 6: Final answer
    x = 24,572.23

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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.