Home / 1,307.63-1,961.65-429.87

Finding the Fourth Proportional to 1,307.63, 1,961.65 and 429.87

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Solution

The fourth proportional to 1,307.63, 1,961.65 and 429.87 is: 644.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.63 : 1,961.65 = 429.87 : x
  2. Step 2: Convert to fraction form
    1,307.63/1,961.65 = 429.87/x
  3. Step 3: Cross multiply
    1,307.63x = 1,961.65 × 429.87
  4. Step 4: Simplify right side
    1,307.63x = 843,262.38
  5. Step 5: Solve for x
    x = 843,262.38/1,307.63
  6. Step 6: Final answer
    x = 644.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.