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Finding the Fourth Proportional to 390,850.80, 586,276.20 and 386,703.60

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Solution

The fourth proportional to 390,850.80, 586,276.20 and 386,703.60 is: 580,055.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,850.80 : 586,276.20 = 386,703.60 : x
  2. Step 2: Convert to fraction form
    390,850.80/586,276.20 = 386,703.60/x
  3. Step 3: Cross multiply
    390,850.80x = 586,276.20 × 386,703.60
  4. Step 4: Simplify right side
    390,850.80x = 226,715,117,134.32
  5. Step 5: Solve for x
    x = 226,715,117,134.32/390,850.80
  6. Step 6: Final answer
    x = 580,055.40

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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.