Home / 287,631.80-431,447.70-259,638.20

Finding the Fourth Proportional to 287,631.80, 431,447.70 and 259,638.20

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Solution

The fourth proportional to 287,631.80, 431,447.70 and 259,638.20 is: 389,457.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,631.80 : 431,447.70 = 259,638.20 : x
  2. Step 2: Convert to fraction form
    287,631.80/431,447.70 = 259,638.20/x
  3. Step 3: Cross multiply
    287,631.80x = 431,447.70 × 259,638.20
  4. Step 4: Simplify right side
    287,631.80x = 112,020,304,222.14
  5. Step 5: Solve for x
    x = 112,020,304,222.14/287,631.80
  6. Step 6: Final answer
    x = 389,457.30

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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.