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Finding the Fourth Proportional to 287,990.40, 431,985.60 and 218,006.40

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Solution

The fourth proportional to 287,990.40, 431,985.60 and 218,006.40 is: 327,009.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,990.40 : 431,985.60 = 218,006.40 : x
  2. Step 2: Convert to fraction form
    287,990.40/431,985.60 = 218,006.40/x
  3. Step 3: Cross multiply
    287,990.40x = 431,985.60 × 218,006.40
  4. Step 4: Simplify right side
    287,990.40x = 94,175,625,507.84
  5. Step 5: Solve for x
    x = 94,175,625,507.84/287,990.40
  6. Step 6: Final answer
    x = 327,009.60

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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.