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Finding the Fourth Proportional to 30,590.70, 42,222.93 and 20,904.08

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Solution

The fourth proportional to 30,590.70, 42,222.93 and 20,904.08 is: 28,852.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,590.70 : 42,222.93 = 20,904.08 : x
  2. Step 2: Convert to fraction form
    30,590.70/42,222.93 = 20,904.08/x
  3. Step 3: Cross multiply
    30,590.70x = 42,222.93 × 20,904.08
  4. Step 4: Simplify right side
    30,590.70x = 882,631,375.39
  5. Step 5: Solve for x
    x = 882,631,375.39/30,590.70
  6. Step 6: Final answer
    x = 28,852.93

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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.