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Finding the Fourth Proportional to 521,130.40, 781,695.60 and 486,138.40

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Solution

The fourth proportional to 521,130.40, 781,695.60 and 486,138.40 is: 729,207.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,130.40 : 781,695.60 = 486,138.40 : x
  2. Step 2: Convert to fraction form
    521,130.40/781,695.60 = 486,138.40/x
  3. Step 3: Cross multiply
    521,130.40x = 781,695.60 × 486,138.40
  4. Step 4: Simplify right side
    521,130.40x = 380,012,248,271.04
  5. Step 5: Solve for x
    x = 380,012,248,271.04/521,130.40
  6. Step 6: Final answer
    x = 729,207.60

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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.