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Finding the Fourth Proportional to 702.40, 1,055.40 and 623.20

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Solution

The fourth proportional to 702.40, 1,055.40 and 623.20 is: 936.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    702.40 : 1,055.40 = 623.20 : x
  2. Step 2: Convert to fraction form
    702.40/1,055.40 = 623.20/x
  3. Step 3: Cross multiply
    702.40x = 1,055.40 × 623.20
  4. Step 4: Simplify right side
    702.40x = 657,725.28
  5. Step 5: Solve for x
    x = 657,725.28/702.40
  6. Step 6: Final answer
    x = 936.40

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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.