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Finding the Fourth Proportional to 287,804.10, 431,706.15 and 90,812.10

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Solution

The fourth proportional to 287,804.10, 431,706.15 and 90,812.10 is: 136,218.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,804.10 : 431,706.15 = 90,812.10 : x
  2. Step 2: Convert to fraction form
    287,804.10/431,706.15 = 90,812.10/x
  3. Step 3: Cross multiply
    287,804.10x = 431,706.15 × 90,812.10
  4. Step 4: Simplify right side
    287,804.10x = 39,204,142,064.42
  5. Step 5: Solve for x
    x = 39,204,142,064.42/287,804.10
  6. Step 6: Final answer
    x = 136,218.15

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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.