Finding the Fourth Proportional to 390,742,497.68, 539,225,707.88 and 214,541,905.76
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Solution
The fourth proportional to 390,742,497.68, 539,225,707.88 and 214,541,905.76 is: 296,068,412.55
Step by Step Solution
- Step 1: Write the proportion equation
390,742,497.68 : 539,225,707.88 = 214,541,905.76 : x - Step 2: Convert to fraction form
390,742,497.68/539,225,707.88 = 214,541,905.76/x - Step 3: Cross multiply
390,742,497.68x = 539,225,707.88 × 214,541,905.76 - Step 4: Simplify right side
390,742,497.68x = 115,686,511,003,360,240 - Step 5: Solve for x
x = 115,686,511,003,360,240/390,742,497.68 - Step 6: Final answer
x = 296,068,412.55
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Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.