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Finding the Fourth Proportional to 851,281.80, 1,276,274.70 and 430,859.40

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Solution

The fourth proportional to 851,281.80, 1,276,274.70 and 430,859.40 is: 645,961.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    851,281.80 : 1,276,274.70 = 430,859.40 : x
  2. Step 2: Convert to fraction form
    851,281.80/1,276,274.70 = 430,859.40/x
  3. Step 3: Cross multiply
    851,281.80x = 1,276,274.70 × 430,859.40
  4. Step 4: Simplify right side
    851,281.80x = 549,894,951,477.18
  5. Step 5: Solve for x
    x = 549,894,951,477.18/851,281.80
  6. Step 6: Final answer
    x = 645,961.13

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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.