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Finding the Fourth Proportional to 611,819.28, 918,289.22 and 312,509.70

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Solution

The fourth proportional to 611,819.28, 918,289.22 and 312,509.70 is: 469,050.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,819.28 : 918,289.22 = 312,509.70 : x
  2. Step 2: Convert to fraction form
    611,819.28/918,289.22 = 312,509.70/x
  3. Step 3: Cross multiply
    611,819.28x = 918,289.22 × 312,509.70
  4. Step 4: Simplify right side
    611,819.28x = 286,974,287,092.89
  5. Step 5: Solve for x
    x = 286,974,287,092.89/611,819.28
  6. Step 6: Final answer
    x = 469,050.74

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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.