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Finding the Fourth Proportional to 1,042.99, 1,439.15 and 623.51

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Solution

The fourth proportional to 1,042.99, 1,439.15 and 623.51 is: 860.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.99 : 1,439.15 = 623.51 : x
  2. Step 2: Convert to fraction form
    1,042.99/1,439.15 = 623.51/x
  3. Step 3: Cross multiply
    1,042.99x = 1,439.15 × 623.51
  4. Step 4: Simplify right side
    1,042.99x = 897,324.42
  5. Step 5: Solve for x
    x = 897,324.42/1,042.99
  6. Step 6: Final answer
    x = 860.34

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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.