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Finding the Fourth Proportional to 390,538.06, 583,211.72 and 386,310.67

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Solution

The fourth proportional to 390,538.06, 583,211.72 and 386,310.67 is: 576,898.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,538.06 : 583,211.72 = 386,310.67 : x
  2. Step 2: Convert to fraction form
    390,538.06/583,211.72 = 386,310.67/x
  3. Step 3: Cross multiply
    390,538.06x = 583,211.72 × 386,310.67
  4. Step 4: Simplify right side
    390,538.06x = 225,300,908,726.30
  5. Step 5: Solve for x
    x = 225,300,908,726.30/390,538.06
  6. Step 6: Final answer
    x = 576,898.73

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.