Home / 813,888,085.60-1,220,832,128.40-782,143,343.20

Finding the Fourth Proportional to 813,888,085.60, 1,220,832,128.40 and 782,143,343.20

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Solution

The fourth proportional to 813,888,085.60, 1,220,832,128.40 and 782,143,343.20 is: 1,173,215,014.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    813,888,085.60 : 1,220,832,128.40 = 782,143,343.20 : x
  2. Step 2: Convert to fraction form
    813,888,085.60/1,220,832,128.40 = 782,143,343.20/x
  3. Step 3: Cross multiply
    813,888,085.60x = 1,220,832,128.40 × 782,143,343.20
  4. Step 4: Simplify right side
    813,888,085.60x = 954,865,722,392,747,776
  5. Step 5: Solve for x
    x = 954,865,722,392,747,776/813,888,085.60
  6. Step 6: Final answer
    x = 1,173,215,014.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.