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Finding the Fourth Proportional to 1,565.40, 2,344.95 and 978.60

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Solution

The fourth proportional to 1,565.40, 2,344.95 and 978.60 is: 1,465.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,565.40 : 2,344.95 = 978.60 : x
  2. Step 2: Convert to fraction form
    1,565.40/2,344.95 = 978.60/x
  3. Step 3: Cross multiply
    1,565.40x = 2,344.95 × 978.60
  4. Step 4: Simplify right side
    1,565.40x = 2,294,768.07
  5. Step 5: Solve for x
    x = 2,294,768.07/1,565.40
  6. Step 6: Final answer
    x = 1,465.93

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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.