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Finding the Fourth Proportional to 1,556.76, 2,148.46 and 858.28

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Solution

The fourth proportional to 1,556.76, 2,148.46 and 858.28 is: 1,184.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,556.76 : 2,148.46 = 858.28 : x
  2. Step 2: Convert to fraction form
    1,556.76/2,148.46 = 858.28/x
  3. Step 3: Cross multiply
    1,556.76x = 2,148.46 × 858.28
  4. Step 4: Simplify right side
    1,556.76x = 1,843,980.25
  5. Step 5: Solve for x
    x = 1,843,980.25/1,556.76
  6. Step 6: Final answer
    x = 1,184.50

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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.