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Finding the Fourth Proportional to 526,280.80, 789,421.20 and 485,730.40

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Solution

The fourth proportional to 526,280.80, 789,421.20 and 485,730.40 is: 728,595.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    526,280.80 : 789,421.20 = 485,730.40 : x
  2. Step 2: Convert to fraction form
    526,280.80/789,421.20 = 485,730.40/x
  3. Step 3: Cross multiply
    526,280.80x = 789,421.20 × 485,730.40
  4. Step 4: Simplify right side
    526,280.80x = 383,445,875,244.48
  5. Step 5: Solve for x
    x = 383,445,875,244.48/526,280.80
  6. Step 6: Final answer
    x = 728,595.60

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Similar ratio
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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.