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Finding the Fourth Proportional to 402,611.38, 555,603.51 and 221,335

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Solution

The fourth proportional to 402,611.38, 555,603.51 and 221,335 is: 305,442.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,611.38 : 555,603.51 = 221,335 : x
  2. Step 2: Convert to fraction form
    402,611.38/555,603.51 = 221,335/x
  3. Step 3: Cross multiply
    402,611.38x = 555,603.51 × 221,335
  4. Step 4: Simplify right side
    402,611.38x = 122,974,502,885.85
  5. Step 5: Solve for x
    x = 122,974,502,885.85/402,611.38
  6. Step 6: Final answer
    x = 305,442.19

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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.