Home / 85,549,731.40-128,308,850.70-53,143,640.20

Finding the Fourth Proportional to 85,549,731.40, 128,308,850.70 and 53,143,640.20

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Solution

The fourth proportional to 85,549,731.40, 128,308,850.70 and 53,143,640.20 is: 79,705,678.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,549,731.40 : 128,308,850.70 = 53,143,640.20 : x
  2. Step 2: Convert to fraction form
    85,549,731.40/128,308,850.70 = 53,143,640.20/x
  3. Step 3: Cross multiply
    85,549,731.40x = 128,308,850.70 × 53,143,640.20
  4. Step 4: Simplify right side
    85,549,731.40x = 6,818,799,396,076,319
  5. Step 5: Solve for x
    x = 6,818,799,396,076,319/85,549,731.40
  6. Step 6: Final answer
    x = 79,705,678.61

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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.