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Finding the Fourth Proportional to 914.74, 1,260.40 and 619.50

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Solution

The fourth proportional to 914.74, 1,260.40 and 619.50 is: 853.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.74 : 1,260.40 = 619.50 : x
  2. Step 2: Convert to fraction form
    914.74/1,260.40 = 619.50/x
  3. Step 3: Cross multiply
    914.74x = 1,260.40 × 619.50
  4. Step 4: Simplify right side
    914.74x = 780,817.80
  5. Step 5: Solve for x
    x = 780,817.80/914.74
  6. Step 6: Final answer
    x = 853.60

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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.