Home / 128,720,320.80-193,089,812.40-77,492,032.80

Finding the Fourth Proportional to 128,720,320.80, 193,089,812.40 and 77,492,032.80

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Solution

The fourth proportional to 128,720,320.80, 193,089,812.40 and 77,492,032.80 is: 116,243,666.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,720,320.80 : 193,089,812.40 = 77,492,032.80 : x
  2. Step 2: Convert to fraction form
    128,720,320.80/193,089,812.40 = 77,492,032.80/x
  3. Step 3: Cross multiply
    128,720,320.80x = 193,089,812.40 × 77,492,032.80
  4. Step 4: Simplify right side
    128,720,320.80x = 14,962,922,075,846,646
  5. Step 5: Solve for x
    x = 14,962,922,075,846,646/128,720,320.80
  6. Step 6: Final answer
    x = 116,243,666.76

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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.