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Finding the Fourth Proportional to 1,018.99, 1,405.20 and 915.67

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Solution

The fourth proportional to 1,018.99, 1,405.20 and 915.67 is: 1,262.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.99 : 1,405.20 = 915.67 : x
  2. Step 2: Convert to fraction form
    1,018.99/1,405.20 = 915.67/x
  3. Step 3: Cross multiply
    1,018.99x = 1,405.20 × 915.67
  4. Step 4: Simplify right side
    1,018.99x = 1,286,699.48
  5. Step 5: Solve for x
    x = 1,286,699.48/1,018.99
  6. Step 6: Final answer
    x = 1,262.72

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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.