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Finding the Fourth Proportional to 660,806.46, 991,281.51 and 211,421.70

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Solution

The fourth proportional to 660,806.46, 991,281.51 and 211,421.70 is: 317,155.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,806.46 : 991,281.51 = 211,421.70 : x
  2. Step 2: Convert to fraction form
    660,806.46/991,281.51 = 211,421.70/x
  3. Step 3: Cross multiply
    660,806.46x = 991,281.51 × 211,421.70
  4. Step 4: Simplify right side
    660,806.46x = 209,578,422,022.77
  5. Step 5: Solve for x
    x = 209,578,422,022.77/660,806.46
  6. Step 6: Final answer
    x = 317,155.53

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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.