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Finding the Fourth Proportional to 1,312.69, 1,811.35 and 753

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Solution

The fourth proportional to 1,312.69, 1,811.35 and 753 is: 1,039.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.69 : 1,811.35 = 753 : x
  2. Step 2: Convert to fraction form
    1,312.69/1,811.35 = 753/x
  3. Step 3: Cross multiply
    1,312.69x = 1,811.35 × 753
  4. Step 4: Simplify right side
    1,312.69x = 1,363,946.55
  5. Step 5: Solve for x
    x = 1,363,946.55/1,312.69
  6. Step 6: Final answer
    x = 1,039.05

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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.