Home / 1,678.02-2,315.58-931.98

Finding the Fourth Proportional to 1,678.02, 2,315.58 and 931.98

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Solution

The fourth proportional to 1,678.02, 2,315.58 and 931.98 is: 1,286.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,678.02 : 2,315.58 = 931.98 : x
  2. Step 2: Convert to fraction form
    1,678.02/2,315.58 = 931.98/x
  3. Step 3: Cross multiply
    1,678.02x = 2,315.58 × 931.98
  4. Step 4: Simplify right side
    1,678.02x = 2,158,074.25
  5. Step 5: Solve for x
    x = 2,158,074.25/1,678.02
  6. Step 6: Final answer
    x = 1,286.08

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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.