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Finding the Fourth Proportional to 638,995.48, 957,988.19 and 318,983.11

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Solution

The fourth proportional to 638,995.48, 957,988.19 and 318,983.11 is: 478,222.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,995.48 : 957,988.19 = 318,983.11 : x
  2. Step 2: Convert to fraction form
    638,995.48/957,988.19 = 318,983.11/x
  3. Step 3: Cross multiply
    638,995.48x = 957,988.19 × 318,983.11
  4. Step 4: Simplify right side
    638,995.48x = 305,582,050,594.56
  5. Step 5: Solve for x
    x = 305,582,050,594.56/638,995.48
  6. Step 6: Final answer
    x = 478,222.55

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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.