Home / 638,566.56-879,601.68-487,401.12

Finding the Fourth Proportional to 638,566.56, 879,601.68 and 487,401.12

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Solution

The fourth proportional to 638,566.56, 879,601.68 and 487,401.12 is: 671,376.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,566.56 : 879,601.68 = 487,401.12 : x
  2. Step 2: Convert to fraction form
    638,566.56/879,601.68 = 487,401.12/x
  3. Step 3: Cross multiply
    638,566.56x = 879,601.68 × 487,401.12
  4. Step 4: Simplify right side
    638,566.56x = 428,718,843,985.88
  5. Step 5: Solve for x
    x = 428,718,843,985.88/638,566.56
  6. Step 6: Final answer
    x = 671,376.91

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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.