Home / 13,749.81-18,971.58-7,780.17

Finding the Fourth Proportional to 13,749.81, 18,971.58 and 7,780.17

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Solution

The fourth proportional to 13,749.81, 18,971.58 and 7,780.17 is: 10,734.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,749.81 : 18,971.58 = 7,780.17 : x
  2. Step 2: Convert to fraction form
    13,749.81/18,971.58 = 7,780.17/x
  3. Step 3: Cross multiply
    13,749.81x = 18,971.58 × 7,780.17
  4. Step 4: Simplify right side
    13,749.81x = 147,602,117.57
  5. Step 5: Solve for x
    x = 147,602,117.57/13,749.81
  6. Step 6: Final answer
    x = 10,734.85

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1.5x scale

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.