Home / 280,721.19-387,404.79-153,405

Finding the Fourth Proportional to 280,721.19, 387,404.79 and 153,405

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Solution

The fourth proportional to 280,721.19, 387,404.79 and 153,405 is: 211,704.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,721.19 : 387,404.79 = 153,405 : x
  2. Step 2: Convert to fraction form
    280,721.19/387,404.79 = 153,405/x
  3. Step 3: Cross multiply
    280,721.19x = 387,404.79 × 153,405
  4. Step 4: Simplify right side
    280,721.19x = 59,429,831,809.95
  5. Step 5: Solve for x
    x = 59,429,831,809.95/280,721.19
  6. Step 6: Final answer
    x = 211,704.12

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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.