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Finding the Fourth Proportional to 321,859.60, 482,875.80 and 287,040.40

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Solution

The fourth proportional to 321,859.60, 482,875.80 and 287,040.40 is: 430,637.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,859.60 : 482,875.80 = 287,040.40 : x
  2. Step 2: Convert to fraction form
    321,859.60/482,875.80 = 287,040.40/x
  3. Step 3: Cross multiply
    321,859.60x = 482,875.80 × 287,040.40
  4. Step 4: Simplify right side
    321,859.60x = 138,604,862,782.32
  5. Step 5: Solve for x
    x = 138,604,862,782.32/321,859.60
  6. Step 6: Final answer
    x = 430,637.65

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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.