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Finding the Fourth Proportional to 555,721.20, 780,109.20 and 555,721.20

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Solution

The fourth proportional to 555,721.20, 780,109.20 and 555,721.20 is: 780,109.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    555,721.20 : 780,109.20 = 555,721.20 : x
  2. Step 2: Convert to fraction form
    555,721.20/780,109.20 = 555,721.20/x
  3. Step 3: Cross multiply
    555,721.20x = 780,109.20 × 555,721.20
  4. Step 4: Simplify right side
    555,721.20x = 433,523,220,755.04
  5. Step 5: Solve for x
    x = 433,523,220,755.04/555,721.20
  6. Step 6: Final answer
    x = 780,109.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.