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Finding the Fourth Proportional to 715,585.65, 987,526.31 and 393,303.93

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Solution

The fourth proportional to 715,585.65, 987,526.31 and 393,303.93 is: 542,769.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,585.65 : 987,526.31 = 393,303.93 : x
  2. Step 2: Convert to fraction form
    715,585.65/987,526.31 = 393,303.93/x
  3. Step 3: Cross multiply
    715,585.65x = 987,526.31 × 393,303.93
  4. Step 4: Simplify right side
    715,585.65x = 388,397,978,701.40
  5. Step 5: Solve for x
    x = 388,397,978,701.40/715,585.65
  6. Step 6: Final answer
    x = 542,769.38

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Double scale
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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.