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Finding the Fourth Proportional to 426,870.81, 640,283.13 and 216,503.28

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Solution

The fourth proportional to 426,870.81, 640,283.13 and 216,503.28 is: 324,743.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,870.81 : 640,283.13 = 216,503.28 : x
  2. Step 2: Convert to fraction form
    426,870.81/640,283.13 = 216,503.28/x
  3. Step 3: Cross multiply
    426,870.81x = 640,283.13 × 216,503.28
  4. Step 4: Simplify right side
    426,870.81x = 138,623,397,773.67
  5. Step 5: Solve for x
    x = 138,623,397,773.67/426,870.81
  6. Step 6: Final answer
    x = 324,743.21

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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.