Home / 1,420.80-2,133.36-904.08

Finding the Fourth Proportional to 1,420.80, 2,133.36 and 904.08

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Solution

The fourth proportional to 1,420.80, 2,133.36 and 904.08 is: 1,357.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.80 : 2,133.36 = 904.08 : x
  2. Step 2: Convert to fraction form
    1,420.80/2,133.36 = 904.08/x
  3. Step 3: Cross multiply
    1,420.80x = 2,133.36 × 904.08
  4. Step 4: Simplify right side
    1,420.80x = 1,928,728.11
  5. Step 5: Solve for x
    x = 1,928,728.11/1,420.80
  6. Step 6: Final answer
    x = 1,357.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.