Home / 1,415.40-2,123.10-929.40

Finding the Fourth Proportional to 1,415.40, 2,123.10 and 929.40

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Solution

The fourth proportional to 1,415.40, 2,123.10 and 929.40 is: 1,394.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,415.40 : 2,123.10 = 929.40 : x
  2. Step 2: Convert to fraction form
    1,415.40/2,123.10 = 929.40/x
  3. Step 3: Cross multiply
    1,415.40x = 2,123.10 × 929.40
  4. Step 4: Simplify right side
    1,415.40x = 1,973,209.14
  5. Step 5: Solve for x
    x = 1,973,209.14/1,415.40
  6. Step 6: Final answer
    x = 1,394.10

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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.