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Finding the Fourth Proportional to 398,708.30, 550,230.74 and 217,430.15

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Solution

The fourth proportional to 398,708.30, 550,230.74 and 217,430.15 is: 300,060.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,708.30 : 550,230.74 = 217,430.15 : x
  2. Step 2: Convert to fraction form
    398,708.30/550,230.74 = 217,430.15/x
  3. Step 3: Cross multiply
    398,708.30x = 550,230.74 × 217,430.15
  4. Step 4: Simplify right side
    398,708.30x = 119,636,748,494.51
  5. Step 5: Solve for x
    x = 119,636,748,494.51/398,708.30
  6. Step 6: Final answer
    x = 300,060.85

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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.