Home / 900,108.78-1,242,099.84-492,129.40

Finding the Fourth Proportional to 900,108.78, 1,242,099.84 and 492,129.40

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Solution

The fourth proportional to 900,108.78, 1,242,099.84 and 492,129.40 is: 679,111.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    900,108.78 : 1,242,099.84 = 492,129.40 : x
  2. Step 2: Convert to fraction form
    900,108.78/1,242,099.84 = 492,129.40/x
  3. Step 3: Cross multiply
    900,108.78x = 1,242,099.84 × 492,129.40
  4. Step 4: Simplify right side
    900,108.78x = 611,273,848,999.30
  5. Step 5: Solve for x
    x = 611,273,848,999.30/900,108.78
  6. Step 6: Final answer
    x = 679,111.08

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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.