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Finding the Fourth Proportional to 398,995.15, 550,612.14 and 217,705.81

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Solution

The fourth proportional to 398,995.15, 550,612.14 and 217,705.81 is: 300,433.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,995.15 : 550,612.14 = 217,705.81 : x
  2. Step 2: Convert to fraction form
    398,995.15/550,612.14 = 217,705.81/x
  3. Step 3: Cross multiply
    398,995.15x = 550,612.14 × 217,705.81
  4. Step 4: Simplify right side
    398,995.15x = 119,871,461,934.53
  5. Step 5: Solve for x
    x = 119,871,461,934.53/398,995.15
  6. Step 6: Final answer
    x = 300,433.38

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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.