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Finding the Fourth Proportional to 1,312.51, 1,811.31 and 715.03

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Solution

The fourth proportional to 1,312.51, 1,811.31 and 715.03 is: 986.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.51 : 1,811.31 = 715.03 : x
  2. Step 2: Convert to fraction form
    1,312.51/1,811.31 = 715.03/x
  3. Step 3: Cross multiply
    1,312.51x = 1,811.31 × 715.03
  4. Step 4: Simplify right side
    1,312.51x = 1,295,140.99
  5. Step 5: Solve for x
    x = 1,295,140.99/1,312.51
  6. Step 6: Final answer
    x = 986.77

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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.