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Finding the Fourth Proportional to 42,859.20, 64,288.80 and 13,276.80

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Solution

The fourth proportional to 42,859.20, 64,288.80 and 13,276.80 is: 19,915.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,859.20 : 64,288.80 = 13,276.80 : x
  2. Step 2: Convert to fraction form
    42,859.20/64,288.80 = 13,276.80/x
  3. Step 3: Cross multiply
    42,859.20x = 64,288.80 × 13,276.80
  4. Step 4: Simplify right side
    42,859.20x = 853,549,539.84
  5. Step 5: Solve for x
    x = 853,549,539.84/42,859.20
  6. Step 6: Final answer
    x = 19,915.20

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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.