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Finding the Fourth Proportional to 520,042.40, 780,139.20 and 220,522.40

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Solution

The fourth proportional to 520,042.40, 780,139.20 and 220,522.40 is: 330,815.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,042.40 : 780,139.20 = 220,522.40 : x
  2. Step 2: Convert to fraction form
    520,042.40/780,139.20 = 220,522.40/x
  3. Step 3: Cross multiply
    520,042.40x = 780,139.20 × 220,522.40
  4. Step 4: Simplify right side
    520,042.40x = 172,038,168,718.08
  5. Step 5: Solve for x
    x = 172,038,168,718.08/520,042.40
  6. Step 6: Final answer
    x = 330,815.66

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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.