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Finding the Fourth Proportional to 611,817.53, 918,286.59 and 312,507.95

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Solution

The fourth proportional to 611,817.53, 918,286.59 and 312,507.95 is: 469,048.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,817.53 : 918,286.59 = 312,507.95 : x
  2. Step 2: Convert to fraction form
    611,817.53/918,286.59 = 312,507.95/x
  3. Step 3: Cross multiply
    611,817.53x = 918,286.59 × 312,507.95
  4. Step 4: Simplify right side
    611,817.53x = 286,971,859,753.39
  5. Step 5: Solve for x
    x = 286,971,859,753.39/611,817.53
  6. Step 6: Final answer
    x = 469,048.12

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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.