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Finding the Fourth Proportional to 1,417.36, 2,124 and 978.16

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Solution

The fourth proportional to 1,417.36, 2,124 and 978.16 is: 1,465.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,417.36 : 2,124 = 978.16 : x
  2. Step 2: Convert to fraction form
    1,417.36/2,124 = 978.16/x
  3. Step 3: Cross multiply
    1,417.36x = 2,124 × 978.16
  4. Step 4: Simplify right side
    1,417.36x = 2,077,611.84
  5. Step 5: Solve for x
    x = 2,077,611.84/1,417.36
  6. Step 6: Final answer
    x = 1,465.83

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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.