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Finding the Fourth Proportional to 78,362.64, 117,703.12 and 69,210

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Solution

The fourth proportional to 78,362.64, 117,703.12 and 69,210 is: 103,955.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,362.64 : 117,703.12 = 69,210 : x
  2. Step 2: Convert to fraction form
    78,362.64/117,703.12 = 69,210/x
  3. Step 3: Cross multiply
    78,362.64x = 117,703.12 × 69,210
  4. Step 4: Simplify right side
    78,362.64x = 8,146,232,935.20
  5. Step 5: Solve for x
    x = 8,146,232,935.20/78,362.64
  6. Step 6: Final answer
    x = 103,955.57

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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.