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Finding the Fourth Proportional to 516,439.80, 712,570.16 and 312,485.65

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Solution

The fourth proportional to 516,439.80, 712,570.16 and 312,485.65 is: 431,159.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    516,439.80 : 712,570.16 = 312,485.65 : x
  2. Step 2: Convert to fraction form
    516,439.80/712,570.16 = 312,485.65/x
  3. Step 3: Cross multiply
    516,439.80x = 712,570.16 × 312,485.65
  4. Step 4: Simplify right side
    516,439.80x = 222,667,948,617.99
  5. Step 5: Solve for x
    x = 222,667,948,617.99/516,439.80
  6. Step 6: Final answer
    x = 431,159.54

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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.