Home / 1,410.25-1,946.21-780.84

Finding the Fourth Proportional to 1,410.25, 1,946.21 and 780.84

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Solution

The fourth proportional to 1,410.25, 1,946.21 and 780.84 is: 1,077.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,410.25 : 1,946.21 = 780.84 : x
  2. Step 2: Convert to fraction form
    1,410.25/1,946.21 = 780.84/x
  3. Step 3: Cross multiply
    1,410.25x = 1,946.21 × 780.84
  4. Step 4: Simplify right side
    1,410.25x = 1,519,688.55
  5. Step 5: Solve for x
    x = 1,519,688.55/1,410.25
  6. Step 6: Final answer
    x = 1,077.60

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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.