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Finding the Fourth Proportional to 287,438.70, 431,158.05 and 265,787.40

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Solution

The fourth proportional to 287,438.70, 431,158.05 and 265,787.40 is: 398,681.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,438.70 : 431,158.05 = 265,787.40 : x
  2. Step 2: Convert to fraction form
    287,438.70/431,158.05 = 265,787.40/x
  3. Step 3: Cross multiply
    287,438.70x = 431,158.05 × 265,787.40
  4. Step 4: Simplify right side
    287,438.70x = 114,596,377,098.57
  5. Step 5: Solve for x
    x = 114,596,377,098.57/287,438.70
  6. Step 6: Final answer
    x = 398,681.10

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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.