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Finding the Fourth Proportional to 53,985.20, 80,977.80 and 39,124.40

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Solution

The fourth proportional to 53,985.20, 80,977.80 and 39,124.40 is: 58,686.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,985.20 : 80,977.80 = 39,124.40 : x
  2. Step 2: Convert to fraction form
    53,985.20/80,977.80 = 39,124.40/x
  3. Step 3: Cross multiply
    53,985.20x = 80,977.80 × 39,124.40
  4. Step 4: Simplify right side
    53,985.20x = 3,168,207,838.32
  5. Step 5: Solve for x
    x = 3,168,207,838.32/53,985.20
  6. Step 6: Final answer
    x = 58,686.60

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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.