Home / 1,557.12-2,148.80-858.48

Finding the Fourth Proportional to 1,557.12, 2,148.80 and 858.48

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Solution

The fourth proportional to 1,557.12, 2,148.80 and 858.48 is: 1,184.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,557.12 : 2,148.80 = 858.48 : x
  2. Step 2: Convert to fraction form
    1,557.12/2,148.80 = 858.48/x
  3. Step 3: Cross multiply
    1,557.12x = 2,148.80 × 858.48
  4. Step 4: Simplify right side
    1,557.12x = 1,844,701.82
  5. Step 5: Solve for x
    x = 1,844,701.82/1,557.12
  6. Step 6: Final answer
    x = 1,184.69

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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.