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Finding the Fourth Proportional to 914.40, 1,368.36 and 621.93

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Solution

The fourth proportional to 914.40, 1,368.36 and 621.93 is: 930.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.40 : 1,368.36 = 621.93 : x
  2. Step 2: Convert to fraction form
    914.40/1,368.36 = 621.93/x
  3. Step 3: Cross multiply
    914.40x = 1,368.36 × 621.93
  4. Step 4: Simplify right side
    914.40x = 851,024.13
  5. Step 5: Solve for x
    x = 851,024.13/914.40
  6. Step 6: Final answer
    x = 930.69

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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.