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Finding the Fourth Proportional to 1,890.32, 2,835.72 and 915.75

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Solution

The fourth proportional to 1,890.32, 2,835.72 and 915.75 is: 1,373.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,890.32 : 2,835.72 = 915.75 : x
  2. Step 2: Convert to fraction form
    1,890.32/2,835.72 = 915.75/x
  3. Step 3: Cross multiply
    1,890.32x = 2,835.72 × 915.75
  4. Step 4: Simplify right side
    1,890.32x = 2,596,810.59
  5. Step 5: Solve for x
    x = 2,596,810.59/1,890.32
  6. Step 6: Final answer
    x = 1,373.74

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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.