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Finding the Fourth Proportional to 642,505.80, 963,758.70 and 455,881.80

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Solution

The fourth proportional to 642,505.80, 963,758.70 and 455,881.80 is: 683,822.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,505.80 : 963,758.70 = 455,881.80 : x
  2. Step 2: Convert to fraction form
    642,505.80/963,758.70 = 455,881.80/x
  3. Step 3: Cross multiply
    642,505.80x = 963,758.70 × 455,881.80
  4. Step 4: Simplify right side
    642,505.80x = 439,360,050,921.66
  5. Step 5: Solve for x
    x = 439,360,050,921.66/642,505.80
  6. Step 6: Final answer
    x = 683,822.70

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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.