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Finding the Fourth Proportional to 611,390.80, 916,721.70 and 374,903.20

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Solution

The fourth proportional to 611,390.80, 916,721.70 and 374,903.20 is: 562,131.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,390.80 : 916,721.70 = 374,903.20 : x
  2. Step 2: Convert to fraction form
    611,390.80/916,721.70 = 374,903.20/x
  3. Step 3: Cross multiply
    611,390.80x = 916,721.70 × 374,903.20
  4. Step 4: Simplify right side
    611,390.80x = 343,681,898,839.44
  5. Step 5: Solve for x
    x = 343,681,898,839.44/611,390.80
  6. Step 6: Final answer
    x = 562,131.29

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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.