Home / 428,918.16-643,294.18-144,578.80

Finding the Fourth Proportional to 428,918.16, 643,294.18 and 144,578.80

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Solution

The fourth proportional to 428,918.16, 643,294.18 and 144,578.80 is: 216,840.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,918.16 : 643,294.18 = 144,578.80 : x
  2. Step 2: Convert to fraction form
    428,918.16/643,294.18 = 144,578.80/x
  3. Step 3: Cross multiply
    428,918.16x = 643,294.18 × 144,578.80
  4. Step 4: Simplify right side
    428,918.16x = 93,006,700,591.38
  5. Step 5: Solve for x
    x = 93,006,700,591.38/428,918.16
  6. Step 6: Final answer
    x = 216,840.20

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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.