Home / 78,389.78-117,586.91-19,225.40

Finding the Fourth Proportional to 78,389.78, 117,586.91 and 19,225.40

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Solution

The fourth proportional to 78,389.78, 117,586.91 and 19,225.40 is: 28,838.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,389.78 : 117,586.91 = 19,225.40 : x
  2. Step 2: Convert to fraction form
    78,389.78/117,586.91 = 19,225.40/x
  3. Step 3: Cross multiply
    78,389.78x = 117,586.91 × 19,225.40
  4. Step 4: Simplify right side
    78,389.78x = 2,260,655,379.51
  5. Step 5: Solve for x
    x = 2,260,655,379.51/78,389.78
  6. Step 6: Final answer
    x = 28,838.65

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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.