Home / 9,780.36-13,502.75-6,428.79

Finding the Fourth Proportional to 9,780.36, 13,502.75 and 6,428.79

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Solution

The fourth proportional to 9,780.36, 13,502.75 and 6,428.79 is: 8,875.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,780.36 : 13,502.75 = 6,428.79 : x
  2. Step 2: Convert to fraction form
    9,780.36/13,502.75 = 6,428.79/x
  3. Step 3: Cross multiply
    9,780.36x = 13,502.75 × 6,428.79
  4. Step 4: Simplify right side
    9,780.36x = 86,806,312.03
  5. Step 5: Solve for x
    x = 86,806,312.03/9,780.36
  6. Step 6: Final answer
    x = 8,875.57

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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.