Home / 1,290.45-1,935.68-457.50

Finding the Fourth Proportional to 1,290.45, 1,935.68 and 457.50

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Solution

The fourth proportional to 1,290.45, 1,935.68 and 457.50 is: 686.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.45 : 1,935.68 = 457.50 : x
  2. Step 2: Convert to fraction form
    1,290.45/1,935.68 = 457.50/x
  3. Step 3: Cross multiply
    1,290.45x = 1,935.68 × 457.50
  4. Step 4: Simplify right side
    1,290.45x = 885,573.60
  5. Step 5: Solve for x
    x = 885,573.60/1,290.45
  6. Step 6: Final answer
    x = 686.25

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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.