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Finding the Fourth Proportional to 129,009.84, 178,050.96 and 72,424.32

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Solution

The fourth proportional to 129,009.84, 178,050.96 and 72,424.32 is: 99,955.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,009.84 : 178,050.96 = 72,424.32 : x
  2. Step 2: Convert to fraction form
    129,009.84/178,050.96 = 72,424.32/x
  3. Step 3: Cross multiply
    129,009.84x = 178,050.96 × 72,424.32
  4. Step 4: Simplify right side
    129,009.84x = 12,895,219,703.35
  5. Step 5: Solve for x
    x = 12,895,219,703.35/129,009.84
  6. Step 6: Final answer
    x = 99,955.32

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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.