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Finding the Fourth Proportional to 42,479.99, 63,715.86 and 12,898.08

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Solution

The fourth proportional to 42,479.99, 63,715.86 and 12,898.08 is: 19,345.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,479.99 : 63,715.86 = 12,898.08 : x
  2. Step 2: Convert to fraction form
    42,479.99/63,715.86 = 12,898.08/x
  3. Step 3: Cross multiply
    42,479.99x = 63,715.86 × 12,898.08
  4. Step 4: Simplify right side
    42,479.99x = 821,812,259.55
  5. Step 5: Solve for x
    x = 821,812,259.55/42,479.99
  6. Step 6: Final answer
    x = 19,345.87

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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.