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Finding the Fourth Proportional to 1,386.48, 1,915.01 and 1,012.87

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Solution

The fourth proportional to 1,386.48, 1,915.01 and 1,012.87 is: 1,398.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.48 : 1,915.01 = 1,012.87 : x
  2. Step 2: Convert to fraction form
    1,386.48/1,915.01 = 1,012.87/x
  3. Step 3: Cross multiply
    1,386.48x = 1,915.01 × 1,012.87
  4. Step 4: Simplify right side
    1,386.48x = 1,939,656.18
  5. Step 5: Solve for x
    x = 1,939,656.18/1,386.48
  6. Step 6: Final answer
    x = 1,398.98

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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.