Home / 78,430.36-108,235.04-42,621

Finding the Fourth Proportional to 78,430.36, 108,235.04 and 42,621

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Solution

The fourth proportional to 78,430.36, 108,235.04 and 42,621 is: 58,817.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,430.36 : 108,235.04 = 42,621 : x
  2. Step 2: Convert to fraction form
    78,430.36/108,235.04 = 42,621/x
  3. Step 3: Cross multiply
    78,430.36x = 108,235.04 × 42,621
  4. Step 4: Simplify right side
    78,430.36x = 4,613,085,639.84
  5. Step 5: Solve for x
    x = 4,613,085,639.84/78,430.36
  6. Step 6: Final answer
    x = 58,817.60

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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.