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Finding the Fourth Proportional to 311,368.39, 429,729.20 and 175,428.59

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Solution

The fourth proportional to 311,368.39, 429,729.20 and 175,428.59 is: 242,114.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    311,368.39 : 429,729.20 = 175,428.59 : x
  2. Step 2: Convert to fraction form
    311,368.39/429,729.20 = 175,428.59/x
  3. Step 3: Cross multiply
    311,368.39x = 429,729.20 × 175,428.59
  4. Step 4: Simplify right side
    311,368.39x = 75,386,785,269.90
  5. Step 5: Solve for x
    x = 75,386,785,269.90/311,368.39
  6. Step 6: Final answer
    x = 242,114.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.