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Finding the Fourth Proportional to 321,428.79, 482,123.88 and 143,888.13

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Solution

The fourth proportional to 321,428.79, 482,123.88 and 143,888.13 is: 215,823.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,428.79 : 482,123.88 = 143,888.13 : x
  2. Step 2: Convert to fraction form
    321,428.79/482,123.88 = 143,888.13/x
  3. Step 3: Cross multiply
    321,428.79x = 482,123.88 × 143,888.13
  4. Step 4: Simplify right side
    321,428.79x = 69,371,903,521.54
  5. Step 5: Solve for x
    x = 69,371,903,521.54/321,428.79
  6. Step 6: Final answer
    x = 215,823.55

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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.