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Finding the Fourth Proportional to 1,438.79, 1,985.55 and 841.33

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Solution

The fourth proportional to 1,438.79, 1,985.55 and 841.33 is: 1,161.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.79 : 1,985.55 = 841.33 : x
  2. Step 2: Convert to fraction form
    1,438.79/1,985.55 = 841.33/x
  3. Step 3: Cross multiply
    1,438.79x = 1,985.55 × 841.33
  4. Step 4: Simplify right side
    1,438.79x = 1,670,508.42
  5. Step 5: Solve for x
    x = 1,670,508.42/1,438.79
  6. Step 6: Final answer
    x = 1,161.05

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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.