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Finding the Fourth Proportional to 479,389.68, 661,638.24 and 288,420.84

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Solution

The fourth proportional to 479,389.68, 661,638.24 and 288,420.84 is: 398,069.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    479,389.68 : 661,638.24 = 288,420.84 : x
  2. Step 2: Convert to fraction form
    479,389.68/661,638.24 = 288,420.84/x
  3. Step 3: Cross multiply
    479,389.68x = 661,638.24 × 288,420.84
  4. Step 4: Simplify right side
    479,389.68x = 190,830,256,956.92
  5. Step 5: Solve for x
    x = 190,830,256,956.92/479,389.68
  6. Step 6: Final answer
    x = 398,069.18

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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.