Home / 1,390,990.92-1,918,608.80-978,402.74

Finding the Fourth Proportional to 1,390,990.92, 1,918,608.80 and 978,402.74

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Solution

The fourth proportional to 1,390,990.92, 1,918,608.80 and 978,402.74 is: 1,349,521.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390,990.92 : 1,918,608.80 = 978,402.74 : x
  2. Step 2: Convert to fraction form
    1,390,990.92/1,918,608.80 = 978,402.74/x
  3. Step 3: Cross multiply
    1,390,990.92x = 1,918,608.80 × 978,402.74
  4. Step 4: Simplify right side
    1,390,990.92x = 1,877,172,099,761.07
  5. Step 5: Solve for x
    x = 1,877,172,099,761.07/1,390,990.92
  6. Step 6: Final answer
    x = 1,349,521.46

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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.