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Finding the Fourth Proportional to 1,578.07, 2,178.05 and 988.19

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Solution

The fourth proportional to 1,578.07, 2,178.05 and 988.19 is: 1,363.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,578.07 : 2,178.05 = 988.19 : x
  2. Step 2: Convert to fraction form
    1,578.07/2,178.05 = 988.19/x
  3. Step 3: Cross multiply
    1,578.07x = 2,178.05 × 988.19
  4. Step 4: Simplify right side
    1,578.07x = 2,152,327.23
  5. Step 5: Solve for x
    x = 2,152,327.23/1,578.07
  6. Step 6: Final answer
    x = 1,363.90

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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.