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Finding the Fourth Proportional to 991,679.60, 1,488,901.80 and 618,431.60

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Solution

The fourth proportional to 991,679.60, 1,488,901.80 and 618,431.60 is: 928,509.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    991,679.60 : 1,488,901.80 = 618,431.60 : x
  2. Step 2: Convert to fraction form
    991,679.60/1,488,901.80 = 618,431.60/x
  3. Step 3: Cross multiply
    991,679.60x = 1,488,901.80 × 618,431.60
  4. Step 4: Simplify right side
    991,679.60x = 920,783,922,416.88
  5. Step 5: Solve for x
    x = 920,783,922,416.88/991,679.60
  6. Step 6: Final answer
    x = 928,509.49

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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.