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Finding the Fourth Proportional to 279,455.64, 385,647.67 and 156,931.01

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Solution

The fourth proportional to 279,455.64, 385,647.67 and 156,931.01 is: 216,564.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,455.64 : 385,647.67 = 156,931.01 : x
  2. Step 2: Convert to fraction form
    279,455.64/385,647.67 = 156,931.01/x
  3. Step 3: Cross multiply
    279,455.64x = 385,647.67 × 156,931.01
  4. Step 4: Simplify right side
    279,455.64x = 60,520,078,357.25
  5. Step 5: Solve for x
    x = 60,520,078,357.25/279,455.64
  6. Step 6: Final answer
    x = 216,564.17

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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.