Home / 639,521.20-957,438.60-390,689.20

Finding the Fourth Proportional to 639,521.20, 957,438.60 and 390,689.20

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Solution

The fourth proportional to 639,521.20, 957,438.60 and 390,689.20 is: 584,907.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,521.20 : 957,438.60 = 390,689.20 : x
  2. Step 2: Convert to fraction form
    639,521.20/957,438.60 = 390,689.20/x
  3. Step 3: Cross multiply
    639,521.20x = 957,438.60 × 390,689.20
  4. Step 4: Simplify right side
    639,521.20x = 374,060,920,683.12
  5. Step 5: Solve for x
    x = 374,060,920,683.12/639,521.20
  6. Step 6: Final answer
    x = 584,907.77

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.