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Finding the Fourth Proportional to 888,128.64, 1,225,627.20 and 485,712

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Solution

The fourth proportional to 888,128.64, 1,225,627.20 and 485,712 is: 670,287.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    888,128.64 : 1,225,627.20 = 485,712 : x
  2. Step 2: Convert to fraction form
    888,128.64/1,225,627.20 = 485,712/x
  3. Step 3: Cross multiply
    888,128.64x = 1,225,627.20 × 485,712
  4. Step 4: Simplify right side
    888,128.64x = 595,301,838,566.40
  5. Step 5: Solve for x
    x = 595,301,838,566.40/888,128.64
  6. Step 6: Final answer
    x = 670,287.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.