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Finding the Fourth Proportional to 570,907.40, 787,861.68 and 312,780.56

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Solution

The fourth proportional to 570,907.40, 787,861.68 and 312,780.56 is: 431,642.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    570,907.40 : 787,861.68 = 312,780.56 : x
  2. Step 2: Convert to fraction form
    570,907.40/787,861.68 = 312,780.56/x
  3. Step 3: Cross multiply
    570,907.40x = 787,861.68 × 312,780.56
  4. Step 4: Simplify right side
    570,907.40x = 246,427,817,472.94
  5. Step 5: Solve for x
    x = 246,427,817,472.94/570,907.40
  6. Step 6: Final answer
    x = 431,642.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.