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Finding the Fourth Proportional to 191,215.40, 286,823.10 and 128,229.80

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Solution

The fourth proportional to 191,215.40, 286,823.10 and 128,229.80 is: 192,344.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,215.40 : 286,823.10 = 128,229.80 : x
  2. Step 2: Convert to fraction form
    191,215.40/286,823.10 = 128,229.80/x
  3. Step 3: Cross multiply
    191,215.40x = 286,823.10 × 128,229.80
  4. Step 4: Simplify right side
    191,215.40x = 36,779,268,748.38
  5. Step 5: Solve for x
    x = 36,779,268,748.38/191,215.40
  6. Step 6: Final answer
    x = 192,344.70

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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.