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Finding the Fourth Proportional to 74,643.40, 104,639 and 74,643.40

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Solution

The fourth proportional to 74,643.40, 104,639 and 74,643.40 is: 104,639

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,643.40 : 104,639 = 74,643.40 : x
  2. Step 2: Convert to fraction form
    74,643.40/104,639 = 74,643.40/x
  3. Step 3: Cross multiply
    74,643.40x = 104,639 × 74,643.40
  4. Step 4: Simplify right side
    74,643.40x = 7,810,610,732.60
  5. Step 5: Solve for x
    x = 7,810,610,732.60/74,643.40
  6. Step 6: Final answer
    x = 104,639

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.