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Finding the Fourth Proportional to 915.90, 1,263.90 and 501.90

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Solution

The fourth proportional to 915.90, 1,263.90 and 501.90 is: 692.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.90 : 1,263.90 = 501.90 : x
  2. Step 2: Convert to fraction form
    915.90/1,263.90 = 501.90/x
  3. Step 3: Cross multiply
    915.90x = 1,263.90 × 501.90
  4. Step 4: Simplify right side
    915.90x = 634,351.41
  5. Step 5: Solve for x
    x = 634,351.41/915.90
  6. Step 6: Final answer
    x = 692.60

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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.