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Finding the Fourth Proportional to 318,407.78, 440,033.18 and 260,956.49

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Solution

The fourth proportional to 318,407.78, 440,033.18 and 260,956.49 is: 360,636.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,407.78 : 440,033.18 = 260,956.49 : x
  2. Step 2: Convert to fraction form
    318,407.78/440,033.18 = 260,956.49/x
  3. Step 3: Cross multiply
    318,407.78x = 440,033.18 × 260,956.49
  4. Step 4: Simplify right side
    318,407.78x = 114,829,513,931.64
  5. Step 5: Solve for x
    x = 114,829,513,931.64/318,407.78
  6. Step 6: Final answer
    x = 360,636.64

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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.