Home / 709,582.12-979,215.30-387,289.72

Finding the Fourth Proportional to 709,582.12, 979,215.30 and 387,289.72

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Solution

The fourth proportional to 709,582.12, 979,215.30 and 387,289.72 is: 534,455.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,582.12 : 979,215.30 = 387,289.72 : x
  2. Step 2: Convert to fraction form
    709,582.12/979,215.30 = 387,289.72/x
  3. Step 3: Cross multiply
    709,582.12x = 979,215.30 × 387,289.72
  4. Step 4: Simplify right side
    709,582.12x = 379,240,019,356.72
  5. Step 5: Solve for x
    x = 379,240,019,356.72/709,582.12
  6. Step 6: Final answer
    x = 534,455.43

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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.