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Finding the Fourth Proportional to 261,305.60, 391,180.80 and 156,070.40

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Solution

The fourth proportional to 261,305.60, 391,180.80 and 156,070.40 is: 233,641.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,305.60 : 391,180.80 = 156,070.40 : x
  2. Step 2: Convert to fraction form
    261,305.60/391,180.80 = 156,070.40/x
  3. Step 3: Cross multiply
    261,305.60x = 391,180.80 × 156,070.40
  4. Step 4: Simplify right side
    261,305.60x = 61,051,743,928.32
  5. Step 5: Solve for x
    x = 61,051,743,928.32/261,305.60
  6. Step 6: Final answer
    x = 233,641.16

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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.