Home / 521,974.19-720,312.13-307,128.17

Finding the Fourth Proportional to 521,974.19, 720,312.13 and 307,128.17

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Solution

The fourth proportional to 521,974.19, 720,312.13 and 307,128.17 is: 423,829.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,974.19 : 720,312.13 = 307,128.17 : x
  2. Step 2: Convert to fraction form
    521,974.19/720,312.13 = 307,128.17/x
  3. Step 3: Cross multiply
    521,974.19x = 720,312.13 × 307,128.17
  4. Step 4: Simplify right side
    521,974.19x = 221,228,146,315.70
  5. Step 5: Solve for x
    x = 221,228,146,315.70/521,974.19
  6. Step 6: Final answer
    x = 423,829.67

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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.