Home / 85,966,420.80-128,707,479.51-77,249,459.79

Finding the Fourth Proportional to 85,966,420.80, 128,707,479.51 and 77,249,459.79

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Solution

The fourth proportional to 85,966,420.80, 128,707,479.51 and 77,249,459.79 is: 115,656,592.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,966,420.80 : 128,707,479.51 = 77,249,459.79 : x
  2. Step 2: Convert to fraction form
    85,966,420.80/128,707,479.51 = 77,249,459.79/x
  3. Step 3: Cross multiply
    85,966,420.80x = 128,707,479.51 × 77,249,459.79
  4. Step 4: Simplify right side
    85,966,420.80x = 9,942,583,263,079,996
  5. Step 5: Solve for x
    x = 9,942,583,263,079,996/85,966,420.80
  6. Step 6: Final answer
    x = 115,656,592.08

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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.