Home / 1,313.18-1,812.15-715.67

Finding the Fourth Proportional to 1,313.18, 1,812.15 and 715.67

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Solution

The fourth proportional to 1,313.18, 1,812.15 and 715.67 is: 987.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.18 : 1,812.15 = 715.67 : x
  2. Step 2: Convert to fraction form
    1,313.18/1,812.15 = 715.67/x
  3. Step 3: Cross multiply
    1,313.18x = 1,812.15 × 715.67
  4. Step 4: Simplify right side
    1,313.18x = 1,296,901.39
  5. Step 5: Solve for x
    x = 1,296,901.39/1,313.18
  6. Step 6: Final answer
    x = 987.60

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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.