Home / 1,313.24-1,812.40-981.09

Finding the Fourth Proportional to 1,313.24, 1,812.40 and 981.09

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Solution

The fourth proportional to 1,313.24, 1,812.40 and 981.09 is: 1,354.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.24 : 1,812.40 = 981.09 : x
  2. Step 2: Convert to fraction form
    1,313.24/1,812.40 = 981.09/x
  3. Step 3: Cross multiply
    1,313.24x = 1,812.40 × 981.09
  4. Step 4: Simplify right side
    1,313.24x = 1,778,125.06
  5. Step 5: Solve for x
    x = 1,778,125.06/1,313.24
  6. Step 6: Final answer
    x = 1,354.00

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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.