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Finding the Fourth Proportional to 989,728.40, 1,483,280.40 and 876,879.20

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Solution

The fourth proportional to 989,728.40, 1,483,280.40 and 876,879.20 is: 1,314,156.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    989,728.40 : 1,483,280.40 = 876,879.20 : x
  2. Step 2: Convert to fraction form
    989,728.40/1,483,280.40 = 876,879.20/x
  3. Step 3: Cross multiply
    989,728.40x = 1,483,280.40 × 876,879.20
  4. Step 4: Simplify right side
    989,728.40x = 1,300,657,730,527.68
  5. Step 5: Solve for x
    x = 1,300,657,730,527.68/989,728.40
  6. Step 6: Final answer
    x = 1,314,156.22

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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.