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Finding the Fourth Proportional to 42,759.40, 64,139.10 and 19,431.40

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Solution

The fourth proportional to 42,759.40, 64,139.10 and 19,431.40 is: 29,147.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,759.40 : 64,139.10 = 19,431.40 : x
  2. Step 2: Convert to fraction form
    42,759.40/64,139.10 = 19,431.40/x
  3. Step 3: Cross multiply
    42,759.40x = 64,139.10 × 19,431.40
  4. Step 4: Simplify right side
    42,759.40x = 1,246,312,507.74
  5. Step 5: Solve for x
    x = 1,246,312,507.74/42,759.40
  6. Step 6: Final answer
    x = 29,147.10

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1.5x scale

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.