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Finding the Fourth Proportional to 990,807.60, 1,486,211.40 and 648,323.40

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Solution

The fourth proportional to 990,807.60, 1,486,211.40 and 648,323.40 is: 972,485.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    990,807.60 : 1,486,211.40 = 648,323.40 : x
  2. Step 2: Convert to fraction form
    990,807.60/1,486,211.40 = 648,323.40/x
  3. Step 3: Cross multiply
    990,807.60x = 1,486,211.40 × 648,323.40
  4. Step 4: Simplify right side
    990,807.60x = 963,545,627,966.76
  5. Step 5: Solve for x
    x = 963,545,627,966.76/990,807.60
  6. Step 6: Final answer
    x = 972,485.10

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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.