Home / 85,671,812.10-128,507,718.15-81,939,915.30

Finding the Fourth Proportional to 85,671,812.10, 128,507,718.15 and 81,939,915.30

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Solution

The fourth proportional to 85,671,812.10, 128,507,718.15 and 81,939,915.30 is: 122,909,872.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,671,812.10 : 128,507,718.15 = 81,939,915.30 : x
  2. Step 2: Convert to fraction form
    85,671,812.10/128,507,718.15 = 81,939,915.30/x
  3. Step 3: Cross multiply
    85,671,812.10x = 128,507,718.15 × 81,939,915.30
  4. Step 4: Simplify right side
    85,671,812.10x = 10,529,911,540,607,272
  5. Step 5: Solve for x
    x = 10,529,911,540,607,272/85,671,812.10
  6. Step 6: Final answer
    x = 122,909,872.95

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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.