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Finding the Fourth Proportional to 1,312.07, 1,810.97 and 840.67

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Solution

The fourth proportional to 1,312.07, 1,810.97 and 840.67 is: 1,160.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.07 : 1,810.97 = 840.67 : x
  2. Step 2: Convert to fraction form
    1,312.07/1,810.97 = 840.67/x
  3. Step 3: Cross multiply
    1,312.07x = 1,810.97 × 840.67
  4. Step 4: Simplify right side
    1,312.07x = 1,522,414.89
  5. Step 5: Solve for x
    x = 1,522,414.89/1,312.07
  6. Step 6: Final answer
    x = 1,160.32

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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.