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Finding the Fourth Proportional to 1,671.75, 2,307.05 and 915.57

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Solution

The fourth proportional to 1,671.75, 2,307.05 and 915.57 is: 1,263.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,671.75 : 2,307.05 = 915.57 : x
  2. Step 2: Convert to fraction form
    1,671.75/2,307.05 = 915.57/x
  3. Step 3: Cross multiply
    1,671.75x = 2,307.05 × 915.57
  4. Step 4: Simplify right side
    1,671.75x = 2,112,261.19
  5. Step 5: Solve for x
    x = 2,112,261.19/1,671.75
  6. Step 6: Final answer
    x = 1,263.50

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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.