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Finding the Fourth Proportional to 42,681.96, 64,020.51 and 13,099.75

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Solution

The fourth proportional to 42,681.96, 64,020.51 and 13,099.75 is: 19,648.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,681.96 : 64,020.51 = 13,099.75 : x
  2. Step 2: Convert to fraction form
    42,681.96/64,020.51 = 13,099.75/x
  3. Step 3: Cross multiply
    42,681.96x = 64,020.51 × 13,099.75
  4. Step 4: Simplify right side
    42,681.96x = 838,652,675.87
  5. Step 5: Solve for x
    x = 838,652,675.87/42,681.96
  6. Step 6: Final answer
    x = 19,648.88

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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.