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Finding the Fourth Proportional to 78,498.36, 117,720 and 25,893.72

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Solution

The fourth proportional to 78,498.36, 117,720 and 25,893.72 is: 38,831.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,498.36 : 117,720 = 25,893.72 : x
  2. Step 2: Convert to fraction form
    78,498.36/117,720 = 25,893.72/x
  3. Step 3: Cross multiply
    78,498.36x = 117,720 × 25,893.72
  4. Step 4: Simplify right side
    78,498.36x = 3,048,208,718.40
  5. Step 5: Solve for x
    x = 3,048,208,718.40/78,498.36
  6. Step 6: Final answer
    x = 38,831.50

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1.5x scale

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.