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Finding the Fourth Proportional to 851,878.60, 1,276,068.30 and 431,391.40

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Solution

The fourth proportional to 851,878.60, 1,276,068.30 and 431,391.40 is: 646,201.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    851,878.60 : 1,276,068.30 = 431,391.40 : x
  2. Step 2: Convert to fraction form
    851,878.60/1,276,068.30 = 431,391.40/x
  3. Step 3: Cross multiply
    851,878.60x = 1,276,068.30 × 431,391.40
  4. Step 4: Simplify right side
    851,878.60x = 550,484,890,432.62
  5. Step 5: Solve for x
    x = 550,484,890,432.62/851,878.60
  6. Step 6: Final answer
    x = 646,201.10

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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.