Home / 390,721.34-539,041.28-245,441.76

Finding the Fourth Proportional to 390,721.34, 539,041.28 and 245,441.76

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Solution

The fourth proportional to 390,721.34, 539,041.28 and 245,441.76 is: 338,612.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,721.34 : 539,041.28 = 245,441.76 : x
  2. Step 2: Convert to fraction form
    390,721.34/539,041.28 = 245,441.76/x
  3. Step 3: Cross multiply
    390,721.34x = 539,041.28 × 245,441.76
  4. Step 4: Simplify right side
    390,721.34x = 132,303,240,475.85
  5. Step 5: Solve for x
    x = 132,303,240,475.85/390,721.34
  6. Step 6: Final answer
    x = 338,612.78

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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.