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Finding the Fourth Proportional to 1,325.76, 1,985.40 and 913.74

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Solution

The fourth proportional to 1,325.76, 1,985.40 and 913.74 is: 1,368.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,325.76 : 1,985.40 = 913.74 : x
  2. Step 2: Convert to fraction form
    1,325.76/1,985.40 = 913.74/x
  3. Step 3: Cross multiply
    1,325.76x = 1,985.40 × 913.74
  4. Step 4: Simplify right side
    1,325.76x = 1,814,139.40
  5. Step 5: Solve for x
    x = 1,814,139.40/1,325.76
  6. Step 6: Final answer
    x = 1,368.38

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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.