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Finding the Fourth Proportional to 42,567.40, 63,853.98 and 12,987.88

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Solution

The fourth proportional to 42,567.40, 63,853.98 and 12,987.88 is: 19,482.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,567.40 : 63,853.98 = 12,987.88 : x
  2. Step 2: Convert to fraction form
    42,567.40/63,853.98 = 12,987.88/x
  3. Step 3: Cross multiply
    42,567.40x = 63,853.98 × 12,987.88
  4. Step 4: Simplify right side
    42,567.40x = 829,327,829.76
  5. Step 5: Solve for x
    x = 829,327,829.76/42,567.40
  6. Step 6: Final answer
    x = 19,482.70

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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.