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Finding the Fourth Proportional to 660,907.20, 991,340.16 and 211,655.04

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Solution

The fourth proportional to 660,907.20, 991,340.16 and 211,655.04 is: 317,475.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,907.20 : 991,340.16 = 211,655.04 : x
  2. Step 2: Convert to fraction form
    660,907.20/991,340.16 = 211,655.04/x
  3. Step 3: Cross multiply
    660,907.20x = 991,340.16 × 211,655.04
  4. Step 4: Simplify right side
    660,907.20x = 209,822,141,218.41
  5. Step 5: Solve for x
    x = 209,822,141,218.41/660,907.20
  6. Step 6: Final answer
    x = 317,475.95

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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.