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Finding the Fourth Proportional to 871,646.40, 1,307,210.40 and 338,860.80

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Solution

The fourth proportional to 871,646.40, 1,307,210.40 and 338,860.80 is: 508,190.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    871,646.40 : 1,307,210.40 = 338,860.80 : x
  2. Step 2: Convert to fraction form
    871,646.40/1,307,210.40 = 338,860.80/x
  3. Step 3: Cross multiply
    871,646.40x = 1,307,210.40 × 338,860.80
  4. Step 4: Simplify right side
    871,646.40x = 442,962,361,912.32
  5. Step 5: Solve for x
    x = 442,962,361,912.32/871,646.40
  6. Step 6: Final answer
    x = 508,190.43

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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.