Home / 121,411.20-182,116.80-77,124.45

Finding the Fourth Proportional to 121,411.20, 182,116.80 and 77,124.45

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Solution

The fourth proportional to 121,411.20, 182,116.80 and 77,124.45 is: 115,686.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,411.20 : 182,116.80 = 77,124.45 : x
  2. Step 2: Convert to fraction form
    121,411.20/182,116.80 = 77,124.45/x
  3. Step 3: Cross multiply
    121,411.20x = 182,116.80 × 77,124.45
  4. Step 4: Simplify right side
    121,411.20x = 14,045,658,035.76
  5. Step 5: Solve for x
    x = 14,045,658,035.76/121,411.20
  6. Step 6: Final answer
    x = 115,686.68

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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.