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Finding the Fourth Proportional to 715,655.54, 987,582.62 and 393,364.64

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Solution

The fourth proportional to 715,655.54, 987,582.62 and 393,364.64 is: 542,831.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,655.54 : 987,582.62 = 393,364.64 : x
  2. Step 2: Convert to fraction form
    715,655.54/987,582.62 = 393,364.64/x
  3. Step 3: Cross multiply
    715,655.54x = 987,582.62 × 393,364.64
  4. Step 4: Simplify right side
    715,655.54x = 388,480,074,881.82
  5. Step 5: Solve for x
    x = 388,480,074,881.82/715,655.54
  6. Step 6: Final answer
    x = 542,831.09

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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.