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Finding the Fourth Proportional to 218,806.80, 328,210.20 and 124,328.40

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Solution

The fourth proportional to 218,806.80, 328,210.20 and 124,328.40 is: 186,492.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,806.80 : 328,210.20 = 124,328.40 : x
  2. Step 2: Convert to fraction form
    218,806.80/328,210.20 = 124,328.40/x
  3. Step 3: Cross multiply
    218,806.80x = 328,210.20 × 124,328.40
  4. Step 4: Simplify right side
    218,806.80x = 40,805,849,029.68
  5. Step 5: Solve for x
    x = 40,805,849,029.68/218,806.80
  6. Step 6: Final answer
    x = 186,492.60

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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.